Yes, Gionee X1 does also have the eye protection mode.
Yes, Gionee X1 does have the USB OTG support.
No. Despite of having huge 3000 mAh battery, Gionee X1 has not reported any heating issue during our review.
Yes, with the help of App Clone functionality, you can use 2 WhatsApp accounts in Gionee X1 at the same time.